1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf39abe9426320fa6a6fe7cfc05dffee5e17a44df55df77236ae5e412b058d8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65a696b3-7d5d-495c-a8c6-2b34e5217cd9.json and https://artists.proofprofile.net/proofs/artist/65a696b3-7d5d-495c-a8c6-2b34e5217cd9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ccf5e85b401ced42721825efdf70c63b900bc5950d7738352d971eb5c7b2da. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d3bf0b7eba41eb89d51934b4d8e8e5fd93870a086756373bab71b61f38b1cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1160f24de42faa6bd50f6de62285ff10959dabcf6dc2853829d396dd543334e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8918894ef674399a9ef22929228c6be36ea0ad8d68d822e2bb4f1b86192eea. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3626f63fa95166a4ec4b55dc4ea1ec3b19f247b985ee5d0dc243859565c6b2. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0d0c7422f0e1cc1afd0e5620cd4249db9d2aeb0289b6d2fef38b9200a7b341. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3e03ceb314c2f4605300f04b4b5826ce950af9b30dd7d69bcd2f74debae421. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f06ec3de7dd5153381b3ca298b346f370bbf23a96a02b990f9ab2e5f1a2dcc0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3e71816722a1bb31058ad1764fbadafcb9729cd75c1bb4dd68dadbff69c0b9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cea0e32bf8de905a92147871526f28e2b0759b99fe98de35c18f4e159236e95. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4bf02a700f84e1de11eded195221c6ef363fd4c0adf34eaefeec6d62240588. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae048035525f79a99d575d5d98a5c3384abbe20e726149455023a52e16fcd52. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7efc72de0ade18de2383a96d63be170722cb46e1c2d98da71f0c14398112449. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ce87567eaa5cf55bbc19362df814f0e8a5deb2687dc173bd902c7c86ffb1fd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8170e5fb34d2cde641bb0b98905a7b30ba1181771aa39f77217b469f6490bb1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd265ab06edd664f21decfa33cd475d50022a955f2ac79a0d88754a9afe53fc35. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ec4441215e94f06cecc5ce1f99c0971fdd57c35c1221d6127f6500f8c4dce1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f99f5d37e5b0e150afb28668ec6d2ef213b405d67da57a7f01f27d27898778e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdf633e489e56885fc612a4d7b7434ad9986e704e8a4c2018dac8a012f1455e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5f51a74998179e7adda37354ef886dbd227aa9a089f0134427726146ed90ca. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCQR0510153.